javascript code to convert current tabs audio stream to stereo

mono_to_stereo.js

(function() {
    // Check if there is an audio or video element on the page
    const mediaElements = document.querySelectorAll('audio, video');
    if (mediaElements.length === 0) {
        console.log('No media elements found on this page.');
        return;
    }

    // Create an AudioContext
    const audioContext = new (window.AudioContext || window.webkitAudioContext)();

    // Function to remix mono audio to true stereo (duplicate mono to both channels)
    function remixToStereo(mediaElement) {
        // Create a MediaElementAudioSourceNode from the media element
        const sourceNode = audioContext.createMediaElementSource(mediaElement);

        // Create a ChannelMergerNode to merge mono channels into stereo
        const mergerNode = audioContext.createChannelMerger(2); // 2 channels (stereo)

        // Connect the source to the merger node
        sourceNode.connect(mergerNode, 0, 0); // Left channel
        sourceNode.connect(mergerNode, 0, 1); // Right channel

        // Connect the merger node to the destination (output)
        mergerNode.connect(audioContext.destination);

        console.log('Audio remixed to stereo.');

        // Start playing the audio (in case it's paused)
        mediaElement.play();
    }

    // Apply the remixToStereo function to all media elements on the page
    mediaElements.forEach(mediaElement => {
        remixToStereo(mediaElement);
    });
})();